Recent Posts

Review: The pivotal role of ethylene in plant growth (Trends Plant Sci)

Phytohormones, their ratios and gradients, regulate plant development to allow them to adapt to environment changes.  Ethylene, one such hormone, is produced in response to a multitude of stresses: biotic, osmotic, flooding, drought or even shading by neighbors. Dubois et al. report in this review how…

Ethylene receptors signal via a noncanonical pathway to regulate abscisic acid responses ($) (Plant Physiol.)

The two-carbon containing gaseous hydrocarbon, ethylene, is one of the most important phytohormones. It is perceived by a set of receptors (ETR1, ETR2, ERS, ERS2, EIN4). Bakshi et al. found that ETR1 (etr1-6) and ETR2 (etr2-3) mutants have opposite effects on seed germination in the presence of NaCl,…

ARF2 – ARF4 and ARF5 are essential for female and male gametophyte development in Arabidopsis (Plant Cell Physiol.)

Auxin is considered a master molecule for plant growth and development; in a whimsical way, IAA (Indole – 3 – Acetic Acid) has been defined as "Induce Almost Anything"! Auxin-mediated gene expression is regulated by Auxin Responsive Factor (ARFs). The model plant Arabidopsis thaliana contains 23…

Combining Forces for Hypocotyl Elongation: Histone Modifications, GA, and the Circadian Clock

Zheng et al. discover proteins that mediate interactions between gibberellins and the circadian clock https://doi.org/10.1105/tpc.17.00830 By Han Zheng and Yong Ding Background: Hypocotyl elongation helps the shoot emerge from the soil surface. The gibberellin (GA) signaling protein RGA inhibits…

Changing Fates: Brassinosteroids Underlying Yield Potential in Millet

Yang et al. reveal a role for brassinosteroids in spikelet and floral meristem fate in Setaria viridis.  The Plant Cell (2017) https://doi.org/10.1105/tpc.17.00816 By Jiani Yang and Andrea L. Eveland Background: Grass inflorescences show extensive morphological diversity between species, due…

The Phytohormone Ethylene and Transcriptional Repression

Zhang et al. investigate histone deacetylase in the ethylene response. Plant Cell (2017). https://doi.org/10.1105/tpc.17.00671 By Fan Zhang Background: Ethylene is the only gaseous hormone in plants, and is a key hormone controlling plant growth and resistance to stress. Epigenetic mechanisms are…

Auxin synthesis contributes to virulence of Pseudomonas syringae (PLOS Pathogens)

Plant pathogens have developed a large range of strategies to allow them to have successful interactions with their plant host, including physiological manipulation. For example, Pseudomonas syringae, the cause of speck disease in many plant systems, manipulates the auxin phytohormone physiology in its…

Cytokinin regulation in the endoplasmic reticulum (Plant Physiology)

Cytokinin is a phytohormone involved in many plant processes such as cell proliferation, apical dominance, leaf senescence, tissue patterning, organ initiation, environmental responses…  To allow for effective control of all these processes, cytokinin concentrations need to be continuously adjusted.…

Chemical hijacking of auxin signaling with an engineered auxin–TIR1 pair ($) (Nature Chemical Biology)

Gene redundancy and/or developmental defects of higher order mutants make it hard to study the role of individual components of auxin signaling. Structural biology approach can provide a detour that circumvents endogenous auxin signaling. Removing of the phenyl moiety of F79 in the auxin receptor…